401421040 has 40 divisors (see below), whose sum is σ = 934449120. Its totient is φ = 160371456.

The previous prime is 401421023. The next prime is 401421043. The reversal of 401421040 is 40124104.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×401421040² = 322277702709363200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401421043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74766 + ... + 79954.

It is an arithmetic number, because the mean of its divisors is an integer number (23361228).

Almost surely, 2^401421040 is an apocalyptic number.

401421040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

401421040 is an abundant number, since it is smaller than the sum of its proper divisors (533028080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

401421040 is a wasteful number, since it uses less digits than its factorization.

401421040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6169 (or 6163 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 401421040 is about 20035.4945035055. The cubic root of 401421040 is about 737.6777945374.

Adding to 401421040 its reverse (40124104), we get a palindrome (441545144).

The spelling of 401421040 in words is "four hundred one million, four hundred twenty-one thousand, forty".